The LLVM Project recently released a new version of their compiler, optimizer and code generators. LLVM includes a drop-in GCC-compatible C/C++ and ObjC compiler, mature optimization technology (including cross file/whole program optimization), and a highly optimizing code generator. For people who enjoy hacking on compilers and runtimes, LLVM provides libraries for implementing custom optimizers and code generators including JIT compiler support. This release is the first to provide beta GCC 4.2 compatibility as well as the new "clang" C/ObjC front-end, which provides capabilities to build source-to-source translators and many other tools.

Read through the comments on the Undeadly.org story regarding integrating PCC into OpenBSD. There are a handful of very long posts on there that go into lots of detail on patches that people have made that have been ignored. Patches that fix issues and long-standing bugs in GCC, patches that fix regressions. And patches that have been summarily ignored.

I'd post the link to the story, but for some reason, we can't access undeadly.org from work (most likely the provincial network folks are blocking it).